JPS6167841A - Lens hood fixing device - Google Patents

Abstract

PURPOSE:To hold the position of a hood precisely and to improve the operability such as the loading and storage of the hood by forming at least one magnet and one adsorbing body to the abutting parts of the outer cylinder of a lens and the hood respectively. CONSTITUTION:An abutting part 1a to be used for positioning of the hood 2 at the loading of the hood 2 and also used as a hood unload preventing mem ber is formed on the outer periphery of the leading part of the outer cylinder 1 of the lens and an abutting part 2a abutting upon the part 1a of the outer cylinder 1 is formed on the inner periphery of the back end of the hood 2. In addition, the magnet 3 and the adsorbing body 4 to be adsorbed to the mag net 3 are fitted to respective abutting parts 1a, 2a. At the use of the hood 2 are abutted on each other and the hood 2 is fixed on a fixed position by the magnet 3 and the adsorbing body 4.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to securing a foot to a lens.

Since then, the technology and the time have been changed to Nobue.Conventional methods of fixing the lens foot include inserting a Fell-shaped member between the lens and the foot to obtain friction and fixing the foot;
Screws were installed around the outer periphery of the lens to secure the hood.

However, when fixing the hood using conventional friction, the hood slides on the lens or tilts due to its own weight, resulting in incomplete fixation.Furthermore, when fixing using screws, etc., there is a relative position between the lens and the hood. Furthermore, as the hood becomes larger as the diameter of the lens becomes larger, it becomes difficult to rotate the hood with one hand.

Purpose The present invention has been made in view of the above points, and it is an object of the present invention to provide a mechanism that uses a magnet to ensure the positioning of the hood and at the same time improves the operability of attaching and storing the hood. That is.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a lens hood portion incorporating a foot fixing device according to the first aspect of the present invention, and a partially cutaway sectional view showing the lift fixing position. FIG. 2 is a detailed sectional view of the fixing portion of the hood and lens.

At the tip of the lens barrel 1, there is a part 1 on the outer periphery that also serves as a stop for the hood 2 to be removed, and the abutment for positioning the hood 2 when it is attached is part 1.
1, and the hood 2 has an abutting part 2a on the inner periphery of the rear end thereof, which abuts against the abutting part 1a of the lens outer cylinder l. or,
A magnet 3 and an adsorbent 4 that adsorbs to the magnet 3 are attached to both abutting portions 1a and 2a.

Usually, the foot 2 has a mark such as a red dot on its outer periphery, so that it can be visually recognized from the outside when the hood 2 is rotated to a desired position. Therefore, the magnet 3 does not necessarily need to be placed all around the abutting portion 2a, but it is sufficient if it has a certain length at at least one location. This also applies to the adsorbent 4. Further, in the above-mentioned embodiment, the magnet 3 was provided on the lens outer cylinder 1 and the adsorbent 4 was provided on the hood 2, but it goes without saying that the magnets 3 and 4 may be provided in the opposite manner.

When the working hood of the embodiment is used, the lens outer cylinder and the abutting portions of the hood come into contact with each other with the hood extended toward the object side, and the hood is fixed in a fixed position by the magnet and the adsorbent. As mentioned above, the present invention has a simple structure for fixing the hood, and also allows the hood to be fixed in a stable state without requiring any complicated operations. I was able to resolve the above problem as well.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a lens hood using the present invention, and FIG. 2 is a partial cross-sectional view of FIG. 1. 1... Lens outer cylinder 2... Hood 3...
・Magnet 4...adsorbent

Claims (1)

[Claims] A lens hood fixing device in which a built-in type and a removable type hood that can be attached to the tip of a lens are provided with at least one magnet and an adsorbent on each abutting part of the lens outer cylinder and the hood.